package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkuHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderEntityVo;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.mysql.cj.util.StringUtils;
import lombok.Data;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@RabbitListener(queues = "stock.release.stock.queue")
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isNullOrEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isNullOrEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            //远程调用设置sku的Name
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                    this.save(wareSkuEntity);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            wareSkuDao.insert(wareSkuEntity);
        } else {
            this.baseMapper.updateStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(id -> {
            SkuHasStockVo hasStockVo = new SkuHasStockVo();
            Long count = this.baseMapper.getHasStock(id);
            hasStockVo.setSkuId(id);
            hasStockVo.setHasHtock(count == null ? false : count > 0);
            return hasStockVo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     *
     * @param wareSkuLockVo
     * @return 库存解锁的长青
     * 1)、下订单成功、订单过期没有支付被系统自动取消,被用户手动取消,都要解锁库存
     * <p>
     * <p>
     * 2)、下订单成功,库存锁定成功,接下来的业务调用失败，导致订单回滚。
     * 之前锁定的库存就要自动解锁。
     */
    @Transactional //默认是运行时异常都会进行回滚
    @Override
    public Boolean orderLockStock(WareSkuLockVo wareSkuLockVo) {
        /**
         * 保存库存工作单的详情
         * 追溯。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(wareSkuLockVo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        //1、按照下单的收货地址,找到一个就近仓库员,锁定库存
        //1、找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = wareSkuLockVo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock skuWareHasStock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            skuWareHasStock.setSkuId(skuId);
            skuWareHasStock.setNum(item.getCount());
            skuWareHasStock.setSkuName(item.getTitle());
            //查询商品在哪个仓库有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            skuWareHasStock.setWareId(wareIds);
            return skuWareHasStock;
        }).collect(Collectors.toList());
        Boolean allLock = true;
        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            Integer num = hasStock.getNum();
            String skuName = hasStock.getSkuName();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品锁定成功,将当前商品锁定了几件的工作单记录发送给MQ
            //2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息,即使要解锁记录,由于去数据库查不到id,所以就不用解锁
            //
            for (Long wareId : wareIds) {
                //成功返回1 否则就是0
                Long res = wareSkuDao.lockSkuStock(skuId, wareId, num);
                if (res == 1) {
                    //锁定成功
                    skuStocked = true;
                    //将库存锁定的信息保存到库存详情表中
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
                    detailEntity.setSkuId(skuId);
                    detailEntity.setSkuName(skuName);
                    detailEntity.setSkuNum(num);
                    detailEntity.setTaskId(taskEntity.getId());
                    detailEntity.setWareId(wareId);
                    detailEntity.setLockStatus(1);
                    wareOrderTaskDetailService.save(detailEntity);
                    //TODO发消息给MQ,通知锁定成功
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    //只发id不行,防止回滚以后找不到数据
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity, stockDetailTo);
                    stockLockedTo.setStockDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                }
                //当前仓库锁失败,重试下一个仓库
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没锁住
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
        }
        //到这边,肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unLockStock(StockLockedTo to) {
        Long id = to.getId();//库存工作单的id
        StockDetailTo stockDetailTo = to.getStockDetailTo();
        Long detailToId = stockDetailTo.getId();
        //解锁
        //1.查询数据库关于订单的锁定库存信息
        //有:证明库存锁定成功了,接下来进行解锁
        //解锁:远程查询订单情况。
        // 1、没有这个订单。必须解锁
        // 2、有这个订单,不是解锁库存,需要判定订单状态。
        //订单状态: 已取消,解锁库存
        //         没取消,不能解锁
        //没有：库存锁定失败,库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity taskDetailEntity = wareOrderTaskDetailService.getById(detailToId);
        if (taskDetailEntity != null) {
            //有才需要解锁
            Long taskId = to.getId(); //获取订单状态的id
            WareOrderTaskEntity orderTask = wareOrderTaskService.getById(taskId);//查询订单号
            String orderSn = orderTask.getOrderSn(); //根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderEntityVo orderEntityVo = r.getData(new TypeReference<OrderEntityVo>() {
                });
                if (orderEntityVo == null || orderEntityVo.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消,才能解锁库存
                    if (taskDetailEntity.getLockStatus() == 1) {
                        //当前库存工作单详情,状态1已锁定但是未解锁才可以解锁
                        unLockStock(taskDetailEntity.getSkuId(), taskDetailEntity.getWareId(), taskDetailEntity.getSkuNum(), detailToId);
                    }
                }
            } else {
                //消息拒绝,重新回队列,让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //没有:库存锁定失败,库存回滚了.这种情况无需解锁
        }
    }

    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unLockStock(skuId, wareId, num);
        //更新库存工作单
        WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity();
        detailEntity.setId(taskDetailId);
        //2.变为已解锁
        detailEntity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(detailEntity);
    }

    //防止订单服务卡顿,导致订单状态一直改不了,库存消息优先到期，查询订单状态一直都是新建状态,什么都不做就走了
    //导致卡顿的订单,永远不能解锁库存
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态,防止重复解锁库存
        WareOrderTaskEntity wareOrderTask = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long taskId = wareOrderTask.getId();
        //按照工作单找到所有,没有解锁的库存,进行解锁
        List<WareOrderTaskDetailEntity> detailEntities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", taskId).
                eq("lock_status", 1));
        for (WareOrderTaskDetailEntity detailEntity : detailEntities) {
            unLockStock(detailEntity.getSkuId(), detailEntity.getWareId(), detailEntity.getSkuNum(), detailEntity.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private String skuName;
        private List<Long> wareId;

    }
}